ga ('set', 'userId', '1234') ничего не отправляет

<script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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    })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

    ga('create', 'UA-36705395-2', 'auto', {'allowLinker': true});
    ga('require', 'linker');
    ga('linker:autoLink', ['my.website.com'] );

    ga('send', 'pageview');
</script>

$.ajax({
    url: 'https://my.website.com/api/check_key?cid=' + cid,
    type: 'GET',
    accepts: {
        json: 'application/json'
    },
    success: function (data) {
        console.log('send userID to GA ('+ cid +')');
        ga('set', 'userId', cid);
    }
});